Mine roof bolts with multiple piece shell having u-shaped spring holding means,申请号US19530358414-传众专利搜索

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发明名称	Mine roof bolts with multiple piece shell having u-shaped spring holding means
摘要
申请公布号	US2787931(A)	申请公布日期	1957.04.09
申请号	US19530358414	申请日期	1953.05.29
申请人	REPUBLIC STEEL CORPORATION	发明人	MCCABE CHARLES P.
分类号	E21D21/00;F16B13/06	主分类号	E21D21/00
代理机构		代理人
主权项
地址

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